U. S. DEPARTMENT OF AGRICULTURE. 

 BUREAU OF PUNT INDUSTRY-BULLETIN No. 4. 



B. T. GALLOWAY. Chief of Bureau. 



RAXGE DIPROVEMEXT IX ARIZOXA. 



(COOPERATIVE EXPERIMEXTS WITH THE ARIZOXA 

 EXPERLMEXT STATIOX.) 



BY 



DAVID GRIFFITHS, 



EXPERT, IN CHARGE OF FIELD MANAGEMENT, 

 GRASS AND FORAGE PLANT INVESTIGATIONS. 



WASHIXGTOX: 



GOVERXMEXT PRIXTIXG OFFICE. 

 1901. 



